I could tell you where it is, but that would spoil all the fun...
This page contains spoilers! Read on your own peril.
The village map, or reconnaissance map, is a simple Mechanist map of the Pagan village Beck o' the Wills. Friend Ashton appears to be the leader of the reconnaissance company, as cartographical inaccuracies are to be reported to him. The map can be found on the ground near to the first hut encountered.
The reconnaissance map.
The map differs from the actual location on several levels. The large scale of the Gathering Place and the sparseness of the trees being the most noticeable inconsistencies. It is not clear why a Shovel and Pick are drawn around the heading "PAGANS LIVE IN HUTS" or why "BARN & SILO" is written in a different font.